Merge pull request #141 from yihui/master

import methods::setPackageName
Default usage for S4 generics
Update readme
Don't double escape \dontrun etc in @example.
Closes #117
Simplify escaping regexps
More robust file naming strategy
Quote non-syntactic usages. Closes #136
Better method for adding block defaults based on objects
Move param tests to own file
Automatically inherit params from generic
Don't inherit from generic if no docs.
Closes #82
Split tests into more files.
And given consistent naming scheme
Use roxygen_wrap value to control wrapping
Reduce default indenting
Turn wrapping off for roxygen2
Update docs. Fix thinko
Parse options from DESCRIPTION roxygen entry
Document roxygen options
Move option parsing into roxygenise.
Add ability to change default roclets
Better slots section formatting.
Closes #143