Fix invalid sentence
First excerise for the 4th task
Formatting
CRUD examples
Descriptions for CRUM + mass-assign problem
Short description of the query language
Formatting
Formatting
Formatting
Query exercises
Test setup for task-4
Description of the examples
Minor improv. in exercises
Merge branch 'master' of git://github.com/apohllo/ror-tasks into task-4
task 4 without validation and query language tests
Merge pull request #5 from Amestris/task-4

Task 4 without tests