Fix typo in Repository JSON key 'forks_count'

It should be 'forks_count' instead of 'fork_count' according to https://developer.github.com/v3/repos/#get.
Merge remote-tracking branch 'origin/pr/264' into develop
Merge remote-tracking branch 'origin/pr/268' into develop

Conflicts:
	github3/repos/repo.py
Release notes for 0.9.1
Also put json.get in the json is not None check
Merge pull request #271 from pamelafox/patch-1

Also put json.get() in the "if json is not None" check
adds support for Python3.4 to tox
Issue #225
Issue #268
Issue #260
Issue #240
Issue #251
Merge pull request #275 from sigmavirus24/contributors

Contributors
tests pass, pulled from 106e0a3e28ebd6570fcdd5e6ca698eafb361d3c8 on 1.0-alpha branch
Merge pull request #279 from sigmavirus24/278

Make tests pass on develop after upgrading to requests 2.4.0 with betamax
tests pass, fixes #248
Merge pull request #280 from esacteksab/248

Use absolute relative imports
addresses #248
Merge remote-tracking branch 'origin/develop' into 1.0-alpha

Conflicts:
	HISTORY.rst
	github3/__init__.py
	github3/decorators.py
	github3/events.py
	github3/github.py
	github3/models.py
	github3/repos/pages.py
	github3/repos/release.py
	github3/repos/repo.py
Merge remote-tracking branch 'origin/pr/281' into 1.0-alpha

Conflicts:
	github3/github.py