Escape database information

The database information is going as a string directly into a PHP file and should be escaped so that whatever was entered will also become a valid string. Since the string is stored between single quotes, only single quotes and backslashes need escaping.
Updated Bootstrap Datepicker to 1.3.0
Update files for new datepicker

- Updated HTML where the datepicker is used
- Fixed JS function in scripts.js which was interfering with the new datepicker
- Removed readonly markings
- Fixes #54: Calendar overlap issue
merged datepicker CSS to style.css
Import datepicker.css in style.scss
Merge remote-tracking branch 'invoiceplane/development' into datepicker-update

Recompiled minified assets.

Conflicts:
	assets/default/css/style.css
	assets/default/js/scripts.min.js
Rename bootstrap-datepicker.css

Rename bootstrap-datepicker.css  to .scss so SASS includes the file in the compiled style.css.
Merge pull request #61 from Jadaw1n/datepicker-update

Datepicker update, solved #54
Log path should be writeable too.
Merge branch 'master' into development
(Reverted 56d518a + setup versioning updates)
Merge branch 'mail-template' of github.com:Jadaw1n/InvoicePlane into Jadaw1n-mail-template
Merge pull request #66 from Jadaw1n/writeable-log-path

Log path should be writeable too.
Update 003_1.1.0.sql

Remove database name from update query.
Merge pull request #74 from Jadaw1n/patch-1

Update 003_1.1.0.sql
Added "VAT ID" and "TAX CODE" to user and client
Merge pull request #76 from B3rn475/development

Added "VAT ID" and "TAX CODE" to user and client
Merge pull request #81 from fkmclane/patch-1

Escape database information
Added custom.css for easy overriding of default css
Merge pull request #93 from InvoicePlane/hotfix

Added custom.css for easy overriding of default css
Added update check to the settings page, first step on #19