Merge pull request #211 from Drayshak/develop

Add Patreon button with logo
Remove specific OpenSSL version from BUILD.md
Let travis build a clang version
Merge pull request #212 from MultiMC/feature_travis_clang

Get Travis to build GCC and Clang versions on Linux as we consider moving to Clang on Linux in general
Detect and report missing local libraries.
Update changelog