* Added support for configuring google analytics
* Adding a configuration parameter 'ga_key' under DXR section
  will publish google analytics snippet in all templates
  this will require rebuilding the templates
* Renamed google analytics configuration key as 'google_analytics_key'
  from existing 'ga_key'
* Documented google_analytics_key in configuration.rst
  Fixes some issues with the last commit
* Added test to verify non-existance of google analytics snippet
* Added tests to check google analytics snippet
* remove the import of 'run'
* Fix test names and doc strings
* Add a test file required to build
Line no in search results act as links
fixed indentation
added fix to results.html
added missing closing anchor
Fix indentation. Remove extra <td>.
Fix crash in dxr/build.py when source tree is empty.
Remove all .pyc files on build.

This fixes a bunch of ImportErrors when switching back and forth between the es and master branches. The git-ignored .pyc files are left alone, and Python happily loads them in various cases.
Allowed gzipped html files to be servered by dxr/app.py. Increase the size of the csv file buffer.