meta.media_uris

Adds media_uris to tweet meta, which returns an array of strings
containing the URIs of media inside your tweet.
Better optional parameter integration

Apparently I'm dumb and didn't know about equal signs in parameters.
Remove * in default .gitignore

corpus/* matches all files in the first level directory inside corpus,
so it would match corpus/lala.txt but not corpus/secret/lala.txt.

corpus/ matches the directory corpus itself, meaning that corpus/ and
everything inside of it shouldn't be uploaded.

corpus/** matches everything inside corpus, including contents of
subdirectories, while still allowing corpus/ itself to be uploaded. This
solves the initial problem I posed (with corpus/secret/lala.txt), but it
just feels tidier to just remove the entire folder.
Merge pull request #44 from Stawberri/gitignore_without_asterisk

Remove * in default .gitignore
Merge pull request #43 from Stawberri/meta_media_uris

meta.media_uris