Add install instructions
Improve a grammar
Use FQN since class is not imported
Merge pull request #443 from JeroenDeDauw/patch-1

Improve a grammar
Merge pull request #444 from JeroenDeDauw/patch-2

Use FQN since class is not imported
Removed version constraint from Installation doc
Merge pull request #453 from mnapoli/patch-1

Removed version constraint from the Installation doc