Restructure the whole project.
Merge branch 'master' of git+ssh://github.com/pretenders/pretenders into dev_alex_restructure_merge

Conflicts:
	pretenders/mocks/http/handler.py
	pretenders/server/apps/replay.py
	pretenders/server/tests/integration/test_maintenance.py
Rename mocks to be mock_servers
Move logging and exceptions out of server/base.py
tidy up docs and requirements.
Make README a symlink to docs/intro.rst
More docs. Pep8.
Add changelog.
Change "I" to "we"
Fix typo.
Merge pull request #52 from pretenders/dev_alex_restructure

Dev alex restructure