updated options and help
Updated print function
Added tests and docstrings to general_helper
Created tests and docstrings in search helper
Removed settings from init req. of gs_helper
Removed settings from init req. of gs_helper
Added a new pairing function
Updated pairing function for search
Added python-dateutil==2.2
improvements to gs_helper and new docstrings
new tests for gs_helper
Updated setup and teardown methods
Updated paired_list function to accept lists
Added Exception class for errors
new tests and docstrings
tests for main landsat
Minor fixes
Minor fix
New documentation
Updated documentation