Unified formatting across files

indent_style = space
indent_size = 2
insert_final_newline = true
each line within { } to specify single rule
converted all the tabs into spaces

and fixed typo in the previous commit
at source/attention_seekers/swing.css
Refactored Gruntfile.js
Merge pull request #165 from sarbbottam/master

Unified formatting and refactored Gruntfile.js