upto file based functions

Branch: plant99/mss:GSOC19-plant99
Branch: wxmetvis/mss:GSOC2019-plant99
Merged
Merged pull request
Merged in plant99/mss/GSOC19-plant99 (pull request #650)
Description
Add File Manager with important functions
add stub code for ftml file
add file based event handlers
Add tests for file-handlers based on HTTP(s)
Add test for save-file, fix pep 8 errors
Allow updation of path