Create simple help service and directive

This commit adds 2 components:

1) A Help Service (gaHelpRegistry). This service can be used
to get a html snippet corresponding to a given help id. Right
now, this html snippets are hard coded, but in the future, they
will come either from some template, url or service. It's a
requirement that the help texts will be used outside of the
application. This needs to be defined first.

2) A Help Directive (gaHelp). This directive can be used to
integrate a help button (currently it's a text) anywhere in
the page and associate it with a given help-id (configured
with ga-help attribute). When the button is clicked, the
help is displayed.

Displaying of help is not nice now. We have 2 options as
of now.

  - Display in modal windows (default)
  - Display in popover

By specifying `help=popover` in the URL parameter, you can
switch between those two options. We are using pure bootstrap
for this. It's likely that we need to find a better solution
to display the help.

For demo purposes, I have integrated this print directive in
two locations:

  - In the bottom bar (next to the coordinate system selection
    combobox), thus placed directly in the index.html
  - In the print section of the accordeion (next to the Layout
    text), thus placed inside a partial

It's far from done, I'm opening it up for review and discussion
and to see how it interacts with existing elements.
Fixing things that got broken during rebase
Remove unneded file after rebase
Full integration with google fusion table

Make sure to get help information from google fusion table.
Using popup service to display gathered help.
Make sure integration is a simple as possible