Added class names for form builder.

Name text field has a class of name and email text field has a class of email
work:center aligned fields
Removed trailing colon in index.html.erb file
Merge branch 'welcome-form-fields' of github.com:sparkbox/apprentice-application into welcome-form-fields
work:began styling the inputs
work:wrote sass to style input placeholder text
work:worked on styling input text; unfinished
work:styled the container and added focus styles
work:added maxlength attribute to inputs and styled .container
work:fixed text within the input to be aligned (padding correction) used outline property for :focus
Renamed name column to first_name and added more attribute fields such as last_name, start_date, end_date and willing_to_move.

Created new migrations to rename and add columns.
work:tinkered with apprentices sass file, don't remember what I did
Changed tests for name validation to first_name validation.
Merge pull request #29 from sparkbox/welcome-form-fields