[TRAVIS] don't build ACE and always build boost on Linux (trusty) * ACE build fails currently, so disabled * Trusty's boost is too old for Gadgetron, so always build our own * fixed cmake configuration comment lines * added notes on build ACE and the meaning of the above comment line.
[TRAVIS] don't build ACE and always build boost on Linux (trusty)
* ACE build fails currently, so disabled
* Trusty's boost is too old for Gadgetron, so always build our own
* fixed cmake configuration comment lines
* added notes on build ACE and the meaning of the above comment line.

CCPPETMR/SIRF-SuperBuild,CCPPETMR/SIRF-SuperBuild