Merge pull request #171 from chrox/master

fix Android build of luasocket luasec and thrift
dummy screen should have width and height
fix blitbuffer to string of extra one byte copying
Merge pull request #172 from chrox/master

fix blitbuffer to string of extra one byte copying
fix BlitBuffer init for SDL2.0
fix koptcontext serialization when boxa or nai has zero size
fix occasional travis fail when building openssl
Merge pull request #173 from chrox/master

fix koptcontext serialization when boxa or nai has zero size
fix test frontend in travis
Merge pull request #174 from chrox/master

fix test frontend in travis
fix segfault when refreshing dummy screen on travis
Merge pull request #175 from houqp/fix1

minor fix
Merge pull request #176 from chrox/master

fix segfault when refreshing dummy screen on travis
refactor(koreader-base): remove reader depencies from launcher