PLD: test and fix for non-string lists, closes #612
DW:Added a validator to check if the project name has been used using a diff case
Merge pull request #615 from onaio/602_Making_project_name_case_insensitive_unique

DW:Added a validator to check if the project name has been used using a ...
Merge pull request #613 from onaio/612-json-endpoint-exception

PLD: test and fix for non-string lists, closes #612
PLD: add token authentication, order matters, closes #614
PLD: lowercase file extensions, closes #567
Merge pull request #616 from onaio/614-json-auth

PLD: use default auth classes, closes #614
PLD: fix for caseinsensitive filesystems
Merge pull request #617 from onaio/567-attachment-casing

PLD: lowercase file extensions, closes #567
DW: Prepares onadata for the python json xls lib which will be added
DW: Added the python-json2xls lib and the test cases
DW: Replaces the / with _ on the field names
DW: Corrected the failing test
Dw: Added external_export in metadata and stores the external server url
DW: Query the data from postgres and not from mongodb
Dw: Code cleanup
DW: Can use either token or the token stored in the metadata
Initial ui changes
DW: add external export ui stuff