adding note that the Python Development Headers are required for installing Carbon to a custom location
python dev headers are required for pip installation.  Correcting the note and moving to earlier in the page.
Move TIME_ZONE default definition to the top
Fix documentation bug in reduceSeries function

- The example given uses the wrong order of parameters in the
  documentation. #745
(#745) Add more clear docs for map/reduce

- Add crosslinks and notes about usage
- Note the short forms of the functions
- Expand example for reduceSeries
Add Vagrantfile

- Vagrantfile installs all required and optional dependencies in a
  consistent linux environment for local development and testing.
Merge pull request #1016 from justenwalker/vagrantfile

Add Vagrantfile
Merge pull request #1015 from justenwalker/745-reduceSeries-doc

Fix documentation bug in reduceSeries function
Merge pull request #1005 from gwaldo/graphite-web-237

Docs: Python Dev Headers needed for custom install location