deleted railsinstaller page and option from installfest
Copying "working effectively" block from intro curriculum

* inserting tips from Intro to Rails docs to Job Board
* minor copyedits (punctuation, capitalization)
Merge branch 'add-working-effectively-to-job-board' of https://github.com/mejarc/docs into mejarc-add-working-effectively-to-job-board
Refactor 'insert' function to reduce repetition

bump some gems
Consolidate 'working effectively' text into two versions instead of four
Merge branch 'master' of https://github.com/railsbridge/docs