Fix issue #127.
Fix issue #126.
Prepare to release version 0.9.1.
Bump version number to 0.9.1
Set development version number to 0.9.2-dev
Fix issue #120.
Adds missing assertion on length of response when testing limit.
Merge master and processors branches
Small bug fix
PEP8 fix
Refactoring calling pre-, post-processor functions
Tests for preprocessor functions
Fix in catching exceptoins
Records the range of issues that this branch fixes.
Cleans up test code.
Adds missing tests for helper functions.