Implemented "info" API
Added documentation for info API
Fixing KeyError when there is no config file
Fixing style error
Removing sensitive information from being reported
Merge pull request #380 from Kitware/info-api

Info api

Closes #366
Implemented ini-style config reading

* "tangelo" section: most settings

* "girder" section: girder api mounting settings

* "vtkweb" section: vtkweb integration settings
Improved config file handling

* specific errors are reported

* "interpolation" style config parser not being used (keep things simple)
Fixing typo in error report
Better startup logging
Simplifying config file handling.

Default search no longer happens.  If a file is not specified with
the -c switch, then just the defaults will be used.