build(npm): remove lock file

feat: lazy evalute common attributes

This should also fix the `this` problem

build(release): enable auto release

feat: expose item-level `get` helper

fix: better HTML content handling

See the parent commit

perf(parser): use sax-js for better performance

I ran into performance problems where saxes just blocks the whole thing
for a second or two depending on how large is the input.

I noticed that other libraries that use sax-js don't suffer the same
problem so I  decided to give sax-js a shot and boom! the problem is
gone.

fix: invalid regular expression flag

Single line (s) flag doesn't work with React Native. This removes it
since we don't really need it.

fix: update typings

test: update Jest to fix Travis

docs: initial README