Add license

Closes #5
feat(http): emit "end" event
Bump version to v0.0.12
Add http.ServerRequest.headers
Bump version to v0.0.13
http.ServerResponse: publish headerSent, getHeader, write
http.ServerRequest: add getHeader
Bump version to v0.0.14
fix(util.loadFile): do not override the exceptions

Closes #6