Change references from BTC Core to LTC Core (#373)

In this commit, all references to `Bitcoin` or `Bitcoin Core` are replaced with `Litecoin` and `Litecoin Core`, respectively.  

In addition, I added a copyright line for *The Litecoin Core Developers* and provided the rightful attribution to the original `Bitcoin Core` team as per their MIT license.

CONTRIBUTING.md

@@ -1,7 +1,7 @@
-Contributing to Bitcoin Core
+Contributing to Litecoin Core
 ============================
 
-The Bitcoin Core project operates an open contributor model where anyone is
+The Litecoin Core project operates an open contributor model where anyone is
 welcome to contribute towards development in the form of peer review, testing
 and patches. This document explains the practical process and guidelines for
 contributing.
@@ -157,11 +157,10 @@ where possible keep them short, uncomplex and easy to verify.
 "Decision Making" Process
 -------------------------
 
-The following applies to code changes to the Bitcoin Core project (and related
-projects such as libsecp256k1), and is not to be confused with overall Bitcoin
+The following applies to code changes to the Litecoin Core project, and is not to be confused with overall Litecoin
 Network Protocol consensus changes.
 
-Whether a pull request is merged into Bitcoin Core rests with the project merge
+Whether a pull request is merged into Litecoin Core rests with the project merge
 maintainers and ultimately the project lead.
 
 Maintainers will take into consideration if a patch is in line with the general
@@ -179,7 +178,7 @@ In general, all pull requests must:
   - Where bugs are fixed, where possible, there should be unit tests
     demonstrating the bug and also proving the fix. This helps prevent regression.
 
-Patches that change Bitcoin consensus rules are considerably more involved than
+Patches that change Litecoin consensus rules are considerably more involved than
 normal because they affect the entire ecosystem and so must be preceded by
 extensive mailing list discussions and have a numbered BIP. While each case will
 be different, one should be prepared to expend more time and effort than for
@@ -220,7 +219,7 @@ higher in terms of discussion and peer review requirements, keeping in mind that
 mistakes could be very costly to the wider community. This includes refactoring
 of consensus critical code.
 
-Where a patch set proposes to change the Bitcoin consensus, it must have been
+Where a patch set proposes to change the Litecoin consensus, it must have been
 discussed extensively on the mailing list and IRC, be accompanied by a widely
 discussed BIP and have a generally widely perceived technical consensus of being
 a worthwhile change based on the judgement of the maintainers.
@@ -260,10 +259,13 @@ about:
 Release Policy
 --------------
 
-The project leader is the release manager for each Bitcoin Core release.
+The project leader is the release manager for each Litecoin Core release.
 
 Copyright
 ---------
+Copyright 2017 The Litecoin Core Developers
+
+- bitcoin: Copyright (c) 2009-2017 Bitcoin Core Developers (MIT License)
 
 By contributing to this repository, you agree to license your work under the 
 MIT license unless specified otherwise in `contrib/debian/copyright` or at