Add simplecov gem

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Add .gitignore

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Typo

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Topic : add #text #lang functions

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Fix Session#topic

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>