installation: relax many pypi packages

Relaxes the version number to be only minimal number and comments whenever there is a potential problem with a specific version (bigger than the one picked).

* Relaxes all the hard constraints on version numbers.
* Comments that Cerberus 0.7.1 will fail.
* Comments Flask-OAuth>=0.5 to be known to fail.
* Comments pyparsing 2.0.2 to be known to fail.
* Comments SQLAlchemy-Utils >0.24 to be depending on SQLAlchemy>=0.9.3.

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**Outdated description**
I made some updates and more importantly documented which ones were failing with a new version.

* Updates alembic to 0.6.5.
* Updates celery to 3.1.13.
* Updates Cerberus to 0.7.0 and comments that 0.7.1 will fail.
* Updates Flask-Cache to 0.13.
* Comment Flask-OAuth>=0.5 to be known to fail.
* Updates inibitset to 2.1.
* Updates msgpack-python to 0.4.
* Updates numpy to 1.8.1.
* Comments pyparsing 2.0.2 to be known to fail.
* Updates PyLD to 0.6.
* Updates raven to 5.0.0.
* Updates rdflib to 4.1.2.
* Updates reportlab to 3.1.
* Updates requests to 2.3.
* Comments SQLAlchemy-Utils >0.24 to be depending on SQLAlchemy>=0.9.3.
* Updates wtforms-alchemy to 0.12.8
* Updates WTForms-Components to 0.9.5