Support equally named scripts in subfolders

[erikbra]

("stolen" from chucknorris/roundhouse#444)

Is your feature request related to a problem? Please describe.
When developing with sub-folders under a RH folder (e.g. /Up/tables/table_1, /Up/tables/table_2), if two scripts have the same name (e.g. /Up/tables/table_1/init.sql, /Up/tables/table_2/init.sql), RH will mistakenly overwrite the entry in ScriptsRun with the text/hash from the second file rather than creating a new entry to represent the different file.

As such, the next time RH processes the folders/files, it believes the first instance has changed and re-runs it (updating the ScriptsRun table entry) and then when it finds the second file, runs it again believing it has changed (updating the ScriptsRun table entry) ... rinse, repeat.

Describe the solution you'd like
The subfolders, relative to the parent folder (e.g. 'up', 'sprocs', etc) should be preserved in the ScriptsRun table