Small improvement in invoice template
Some fixes
Merge branch 'shineisp/sandbox'

Conflicts:
	application/modules/default/views/helpers/Shopmenu.php
Improvements in invoice creation. Now formatted_number is saved based on invoices_number_format settings
Fix github #187
Add support for invoice sequential number greater than 0. Github #189
Invoices template is now choosable by a setting.
Improvements for invoice management from the administration panel
More improvements for invoices
Improvements in invoices.
Updated schema.yml to add an index for formatted_number
Improvements when filtering Orders and Invoices grids
Merge branch 'shineisp/sandbox'

Conflicts:
	application/configs/data/fixtures/SettingsParameters.yml
	application/models/Invoices.php
Fix typo
Merge pull request #190 from guestisp/master

Check of the guestisp code features merging the code to the ShineISP sandbox