implement first two ticket retreiving methods on the core side of
Persistence

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
Add documentation for Persistence module so far

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
change Persistence registry to a vanilla hash

Since we're trying to remove AS from the project we need to stop using
its classes.

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
remove un-necessary parts of prefixing regex

Specifying \w+ here lead to these specs failing occasionally
when the random string generator included a - in the ticket
string. Since we only care about the prefix in these specs there
is no need to check the random part of the string.
implement loading TGT's and LT's for InMemory adapter

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>