Rudimentary support for string ranges
implemented magical string increment function. Used in auto-increment, and enumerating string ranges as well.
preserve length/format of the incremented string ("01" -> "02")
implemented string range enumeration using magicalStringIncrement function and added more tests
merged with master
Merged changes made to branch 'runtime-improvements' (same as pull request #54)
make sure we support pre- and post-increment on string values
Merge pull request #55 from brianphillips/string-ranges

make sure we support pre- and post-increment on string values
Merge pull request #56 from MoeOrganization/prakashk/string-ranges

Support for string auto-increment and string ranges