Removed spaces at the end of lines; done automatically by my configuration of Sublime Text
Resolved test case failure: test_custom_search (test_examples.ExamplesTestCase)

Switched from float to Decimal computation in tophashtags.py unit test. This ensures uniform precision on all platforms. Without this fix precision is different on OS X 10.8 than it is on CentOS 6.4, OS X 10.9, and Windows Server 2008 R2.