-- CRM-12847 CiviHR - Sort tabs on "Contact" screen

1. Renamed "Summary" tab to "Contact Details"(as per comment in the issue).
2. Made "job" tab as default and moved it to the beginning. This is done using js as contact tab is not accessible within hook_civicrm_tabs. So, to move jobs tab ahead of summary tab, I used js function prependto() and made it the default tab by passing its index as selected in jquery tabs().
3. Sorted the tabs in alphabetical order using civicrm_tabs hook.
4. Moved "Change Log" tab to the end using civicrm_tabs hook.