[Travis] Use travis submodule
Complete Readme.
[Travis] Use travis submodule

Correct branch and email information.
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)
[Travis] Synchronize.
Merge branch 'master' into with_mutex

Conflicts:
	.travis
	src/interpreter.cc
[Travis] test branch with_mutex