Add ability to lookup email-id for specific HTML element.

Bump version.

Bump version. Release.

Bump version. Update changelog.

Add parameters to control button-text in api.tools.add_modal_window

Update changelog for 0.8.0

Update changelog. Bump version.

Bump version. Update changelog.

Update changelog. Bump version.

Fix error with api.dom.compose.send()

This event would also trigger all custom compose-buttons added through
api.tools.add_compose_button()-function.

This closes KartikTalwar#480.

Fix look of `api.tools.add_compose_button()` in new Gmail.

Update changelog.