Merge branch 'release/alpha2.2' into 7.x-2.x

* release/alpha2.2:
  #52 default value for check is 0.0000001 and added check to avoid count tobe equal to zero
  added test case to demonstrate log(0) bug #52
Get most used terms
Ehm. Actually, we order descending :)
Merge branch '7.x-2.x' of github.com:berkes/tagadelic into 7.x-2.x

* '7.x-2.x' of github.com:berkes/tagadelic:
Add More tags link. This closes #59