all rule matches for a given file should be merged to one dictionary

[needmorecowbell]

Currently rule matches are paired with a filepath. This means that if two rules flag for the same file, they will both be put into a list. Instead of this, the list should be a dictionary, and any time a rule is matched, it the flag id should be added to a list in the value portion.

so right now it is:

"path/to/file1" : "ruleName",
"path/to/file1": "rule2Name"

instead..
"path/to/file1": [ "ruleName", "rule2Name"]