THRIFT-2846 Expose ciphers parameter from ssl.wrap_socket()

fix: add missing comma
make style applied
THRIFT-2859: JSON generator - fixed i64 numbers generation

Client: JSON
Patch: Stig Bakken

Also forced "C locale" for numbers - problems where detected in JSON lib
in C++, so fixing it in generator also might be a good idea.

This closes #305
THRIFT-2855 Move contributing.md to the root of the repository