Introduce project setup script

[Pivotal Tracker Chore](https://www.pivotaltracker.com/story/show/72308404)

* Created a project setup script
* Updated `seeds.rb` file to run `db:import_pages` automatically
`if [ $? = 0 ]` tests for the exit value of the previous query. `0` for success, otherwise failure. `=` and `==` are similar in Bash.