[Travis] Use travis submodule

Correct branch and email information.
[Travis] Synchronize
Complete Readme.
Remove use of BOOST_FILESYSTEM_VERSION=2

This crashes for most recent versions of boost
Move the deprecated keyword before the declaration.
Limit linking with boost to unix versions.
A better way to handle and display the error in a python file.

Former version crashed in case of syntax error
(cf test_syntax_error.py)