refactor to eliminate some code excess
add log information
fix pomodoro mode
add a new tab "categories"
add Categories section
if display categories, display categories
add categories.html
add notice about "not built yet"
move
add placeholder for create category form template
add new session variable
add categories.coffee
add a button to make the category form appears
add input for creating a category
move
add css to input element
don't show create button if the create form is displayed
click #create will pop up the create form
add a cancel button
add ID for create and cancel buttons