Adding a new metadata column contain the entry id.
Function for Metadata and more to adding entryid

Adding the ability to display the entry_id in both the application and
through exporting.

Created function to access all the current metadata columns that are
available
Fixing search for entry_id

- Adding a check that was missing cause the search to fail
- Committing 2 files that were not saved before the previous commit
Fixing issue with sorting

Was an issue that when trying to sort the entry_id column, it return
nothing. This is now fixed.
Merge ecffe10c64f06a3a81588c375b110bf28222954b into d01bb2985cfda1a5ee48f42bd97cb4b94e9f3904
Travis updating test DB [skip ci]