Modified rails3 patterns to tolerate no indentation

Some logging mechanisms (e.g. syslog) tend to remove indentation from
parsed log lines. The new regex patterns will cover these cases.
Refactored rails3 file format regex patterns

Removed BOL/space from patterns in favor of \b (word boundary) to match
lines modified by some alternative loggers.
Merge pull request #134 from nanowrimo/master

Modified rails3 patterns to tolerate no indentation