Merge pull request #78 from dethstar/master

Some string changes + longclick on contacts/requests
adds some more strings with their spanish translation
Change literal strings to use their resource strings
add longclick listener to the items that aren't header in the contacts fragment
remove unused imports
changes to peticion to plural peticiones
Removed unused strings and fixed a crash
Italian translation
Fixed apostrophe not preceded by "\"
Merge pull request #79 from Ansa89/patch-1

Fixed apostrophe not preceded by "\"
Update README.md
Update README.md
Merge remote-tracking branch 'upstream/master'
Updating build tools version
added German translations
Merge pull request #80 from sudden6/master

added German translations
Explicitly load libtoxcore.so
Merge remote-tracking branch 'antox/master'
Explicitly load libsodium.so
Load libsodium before libtoxcore