bug fix in source_gist
update source_gist that now accepts default url such as "https://gist.github.com/1654919"
Merge branch 'master' into feature/gist

Conflicts:
	R/run-source.r
Update news for source_gist.
Namespace fixes
Add win builder question
Add bioconductor data repos
Dependency improvments
Use httr for web requests and stop on http error.
Fixes #82
Re-roxygenise
With suite. Fixes #89
Merge pull request #66 from kohske/feature/gist

Bug fix in source_gist
Expore with functions
Update docs
Keep source when installing.
Closes #90
Suggest Biocinstaller
Add missing httr imports
Tweak url printing
Install package from bitbucket. Fixes #96
check(): allow args to be passed to R CMD check