first commit v0.2.0

- added events
- performance improvements
- added new test (in progress)
added: comments
created: todolist
added: error event
new changes
clean code
new changes

- updated detach (it waits for last query)
- improvement retrieve data
added: streaming
new changes
fixed grammar
new informations
clean line
added: isolation to event
added: events
updated transaction types
updated text
Merge pull request #35 from hgourvest/v0.2.0

V0.2.0