Add Creative Segment Filter Support

In order to use this feature you should add at the creative level,
the "SegmentCreative" json object. Example:
    "segmentFilter": {
        "mySegmentFilter": {
            "exclude": [ "water" ],
            "include": [ "beer" ],
            "excludeIfNotPresent": true
        }
    }
Add creative segment filter for mraid capable bid requests.

This filter can be added at the creative level like this:
    "segmentFilter": {
        "supportedSDKs": {
            "exclude": [],
            "include": [ "MRAID" ],
            "excludeIfNotPresent": true
        }
    }
Also "ORMMA" and "VPAID" bid request can be filtered.
Move CreativeSegmentListFilter to generic_creative_filters
python.mk: enable python without requiring the existence of python_requirements.txt
updated jml-build
mongo_basic_test set to manual mode, as it required mongod
HttpClient: improved exception safety in constructor (TRIVIAL)
added doc and file writer to logs
Merge pull request #215 from pablin87/creative-segment-filter-sdk-support2

Creative segment filter support with SDK segment filter (for MRAID capable bid request )
Merge pull request #217 from datacratic/upstream_28_10_2014

Upstream 28_10_2014
Epoller: handleEvents now cap at a maximum number of events to handle rather than throwing an exception
Merge pull request #148 from datacratic/epoller-max-events

Remove an hard limit in the Epoller
PLAT-747: enable exception tracer registration and validation at runtime

This is done by requiring "exception_tracer" to return bool and to be initialized at nullptr. The regular exception tracer thus becomes "default_exception_tracer", which is executed when the former is not "installed" or returns false.
updated jml
PLAT-747: Removed the dependency of libjs on libnode_exception_tracing.so (TRIVIAL)
moved exception_handler.cc back into libarch
Merge remote-tracking branch 'rtbkit-rtbkit/master'
Merge commit 'f507d2a361e4b8b713c8561fbe4059cf8c7efec4'
Merge commit '507e55784271a6c88d0a924c5d0f581dbb1824e7'
Merge commit 'e188b79da502f70ce2170b028953bdd9a42439c4'