add pow() function, convert squareRoot() and invert() to use safePow() instead, refs #803
minor consistency:  whitespace
adding the Basic Idea and Step1 of Getting Data from Wikidot
adding the Configuring Data Retention sections from Wikidot. Some was deferred to the more modern doc.
adding Understanding the Message Format section based on the Wikidot page.
appeasing TravisCI persnickitiness.  It's a word.  Deal.
I think Travis / RST may have been complaining about the lack of newline after the header
bikeshedding for Travis and rST
life's too short. Removing the link because Travis and rST apparently have .
I think I had this one mis-quoted
Add URL shortening views

Links to graphite images are completely unpastable to jabber/irc/mail as
clients mangle the humongous urls. These commits add a url shortener
that can shorten any graphite url from /what/ever/.... to
/S/something_short.

It can be used manually by prepending /s to any url. This will return a
shortened version of that url. Subsequent commits will integrate this
with the composer and dashboard, and maybe other places.
Integrate the URL shortener

- The composer gets a button to shorten the URL to the current graph.
- The menu that appears when clicking on a graph in the dashboard
  gets a similar item.
Merge pull request #823 from deniszh/master

Fixing safe pickles list to making remote rendering work.
attempting a different kind of link, because rST
Merge remote-tracking branch 'upstream/master'
Merge branch 'death-to-wikidot'
Merge pull request #821 from gwaldo/master

Merge the "Feeding Graphite" Documentation
Merge pull request #158 from seveas/url_shortener

Make graphite's /render/?.... urls copy-pastable
make safePow more impervious to math domain errors
wrong var name