CONNT-34: Implemented base functional test class:

- Added helper class to be used as common ancestor for all functional
tests.
- Added missing headers.
- Updated hgignore file to exclude the geckodriver.log.

CONNT-34: Updated development environment set-up for functional test runs:

- Added instructions for downloading and unpacking Mozilla Firefox and
geckodriver.
- Updated development and testing requirements files.

CONNT-28: Renamed test project projtest to testproject:

- Updated Mercurial ignore file for new naming schema.
- Updated documentation.
- Renamed the directory.
- Updated the setup script.
- Updated the project files.