~gbmor/rustwtxt

further check for improperly formatted statuses
updated crate metadata
cut some unnecessary code
added docs.rs badge
changed doc comments around
updated integ test
documentation added for new methods
changed structs api
testing for panic in Twtxt::new()
Tweet/Twtxt structs tested
impl blocks for Twtxt/Tweet
structs for twtxt.txt/statuses
returning Option<T> for several funcs
parse nick from mention
using http_req instead of reqwest
brought the dependency list from 186 to 37
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