* adding arguments to felt for running different type of tests
* adding test type enums to felt
* more changes to felt for testing branches
* more additions to code
* more changes to felt
* adding code for cloning web_drivers
* validating test directories. running the integration tests. update the readme file partially
* Removing todo lists used for development
* addressing reviewers comments
* remove unused imports
* addressing more reviewer comments
* addressing more reviewer comments
* addressing reviewer comments.
* addressing reviewer comments.
* fixing typos
* using chromedriverinstaller as a library. Fixing the commit number used from web_installers repo
* clean drivers directory after tests finish
* addressing more reviewer comments
* throwing all critical exceptions instead of logging and returning boolean flags
* adding todos for items we can do for making felt easier to use for local development
* do not run integration tests on CIs. Added an issue to the TODO.
* changing todo's with issues.
1. Various functionalities offered by this tool are now organized into commands (e.g. `felt test`, `felt check-licenses`).
2. The felt tool can now be invoked from anywhere, not necessarily from the web_ui directory.
3. This new structure helps us scale better as we add more commands (e.g. soon a `build/watch` command is coming).
