Replaced font-awesome with a smaller icomoon custom font

[GarySiu]

Closes #43

• Removed font-awesome from package.json
• Added custom icon font generated from icomoon
• Replaced old sass with new sass
• Edited gulp task. If we're changing build tools, you may want to account for this.

To use the custom font, set any element to the class "icon-*". Browsers that cannot load the font will get placeholder emoji. Currently available icons:

icon-FCCfire icon-envelope icon-link icon-facebook icon-twitter icon-linkedin

Minor changes

• Fixed typos
• Converted all indents to spaces