initial work on own package skeleton
add Rcpp LinkingTo; separate entries with newlines
add simple rd; use devtools opts if available; fixes
validate package name in project dialog
Merge branch 'master' into feature/package-skeleton

Conflicts:
	src/cpp/session/modules/SessionCodeTools.R
fix bad merge
more tweaks + fixes
more tweaks re: devtools options settings
use '.rs.error' to signal error results
Merge pull request #249 from rstudio/feature/package-skeleton

initial work on own package skeleton