Removed within.

Closes #205.
Installing cssselect before run tests.
Updated selenium to 2.29.0.
request_handler: fixed files uri verification.
Set `request_handler.RequestHandler` user-agent to "python/splinter". Fix #209
request_handler: fix handling of file:

It should skip file: and file://, not only file:

Fix #208.
docs/news: added release notes for 0.4.10
setup: bump to 0.4.10
zope.testbrowser supports `is_text_present`
Fix try/except of zope.testbrowser's `is_text_present` and enable tests to that feature. Refs #210
make deps: refactored to use pip.
make doc_deps: refactored to use pip.
make test: executing report only if all tests are ok.
Remove unused import.
makefile: added a new task for run the coverage.
Merge branch 'master' of github.com:cobrateam/splinter into python3

Conflicts:
	Makefile
	splinter/within.py