modified login and log out link according to the user session . adding css file to change the color of the nav bar i application.css
add simlpe photo for home page
adding account setting for user(when he/she is login) to change the password or email or delete its account
Fix db problem (revert changes in old migration and add new migration to change column names and add new column in users)
Missing sessions controller added
Missing views for sessions added
Add authorization to access some resources and actions (for admin only, logged in user only, etc)
adding charts to the project
adding culum chart to charts to the project
Merge branch 'soheil' of https://github.com/nad0u/budget-manager into develop

Conflicts:
	app/controllers/budgets_controller.rb
change location of the call to chartkick in the head (layout) + test chartkick to plot the category name/is_expense and sum the amount
change float to decimal for budget amount (problem in charts otherwise) + add some charts (not finished) + arrange design and permissions
remove is_blocked from users model + fix form layout (edit and new) + fix authorization bugs + when editing his profil, user doesn't need to fill the password confirmation if the password didn't changed
db migration to remove is_blocked from users model
add date picker with bootstrap 3 css
actions from budgets with ajax
arrange login form design (bootstrap)
actions from categories with ajax
add ajax for users actions + little fixes
add ajax to show charts by year, month and day + several fixes