utils: fix messages in ModuleManager

the error/warning messages were ill-formed for boost::fmt while checking the
compatibility of module versions vs. current VLE version.

(cherry picked from commit 382d4bbe67567f43540bcefda14985c0515ac153)
utils: remove extra test of finished spawn

into get(string*, sting*) function, a test was performed on the spawn which
lead to the the fact that last log was not taken into account.

(cherry picked from commit 7a0bc2d9d06a52c3e9293895ad24166218d1fd68)
github: add travis hooks config

Add travis hooks for VLE 1.1.x

(cherry picked from commit 4cc576c62f6026a66a56956eedb61c15d83167ba,
6939d8848b52535644e003f47da3d4d92ef6cd4b and
6a942462b7c4738fbe27a50be9a455ab69b07068)