Add betas section and link to 0.9rc1
Fixes an issue: onResourceResponse may not called with Gecko 24
Fixed an exception when opening a page whereas navigation is locked

Closes #114
It should supports scripts starting with a shebang

Closes #121
Release of SlimerJS 0.8.5
bumped version to 0.8.6pre
Merge branch 'v0.8'

Conflicts:
	docs/conf.py
	docs/release-notes.rst
	src/application.ini
	website/download.html
	website/index.html