Implement a dashboard infrastructure to allow us to register widget types, create dashboards, create instances of widget types with specific configuration and associate those with a given dashboard, at a given position. The dashboard infrastructure is moved out of hid and into it's own application as it is stand alone (the widgets may depend on hid specific logic, but the infrastructure doesn't).

This also fixes error handling for malformed dates

It is now possible to specify a date format string (as used by
strptime) for date columns in the spreadsheet.

https://trello.com/c/81jGz7rm/35-apply-minimal-dashboard-design

https://trello.com/c/dEa42JFS/21-bug-column-display-of-time-to-be-dd-mmm-yyyy

Was getting:

~/workspace/internewshid/django/website➔ ./manage.py --version
/home/marks/workspace/internewshid/django/website/data_layer/models.py:11: RemovedInDjango19Warning: Model class data_layer.models.Message doesn't declare an explicit app_label and either isn't in an application in INSTALLED_APPS or else was imported before its application was loaded. This will no longer be supported in Django 1.9.
  class Message(DataLayerModel):

/home/marks/workspace/internewshid/django/website/data_layer/models.py:11: RemovedInDjango19Warning: Model class data_layer.models.Message doesn't declare an explicit app_label and either isn't in an application in INSTALLED_APPS or else was imported before its application was loaded. This will no longer be supported in Django 1.9.
  class Message(DataLayerModel):

1.8.2

'transport' app imports 'data_layer' so changed their order in
LOCAL_APPS

Still need to handle row numbers correctly

Includes a hacky fix to skip ignored values and a temporary hardcoding
of the sheet profile.

normalize_row doesn't really need to dealw ith None
and theres a slightly more elegant way to calculate row numbers

According to  http://getbootstrap.com/css/#grid-intro
the proper way to get a full page layout is to use container-fluid
but a normal row, which has negative margin to undo the padding.

It's all very confusing; but this feels better than my first effort.