Include uncataloged id's in item record search

[crowesn]

Resolves #418

The search controller was using a restrictive regex to identify item record numbers in search strings, looking for precise pattern of a string initilized by a single lower-case "i", followed by a series of numeric characters. Not all records have these item-record numbers: those without are assigned an identifier initialized with 'notcat' and a series of numeric characters. Staff expected the "notcat" identifiers to be retrievable via search but results excluded these records.

To fix, we edit the regex patter for item-record retrieval to include any initial alpha character series followed by digits. This will return results with identifiers initialized with "i", "notcat" and any other series of alpha characters followed by numeric characters.

[Janell-Huyck]

Looks good for expanding search abilities while maintaining performance. We're assuming no titles will start with i1234 or notcat1234, which seems reasonable.

[Janell-Huyck]

Works as expected when deployed to libappstest.