AddReview Component functionality

[fess986]

• [x] review text 50-400 characters
• [x] inactive post button, when less 50 characters
• [x] block form when posting review in process
• [x] back to film page, when post is complete
• [x] show "add review" button only for authorized
• [ ] show error message, if post review fails

[fess986]

review text 50-400 characters and inactive post button, when less 50 characters - resolved in 450bf65

[fess986]

show "add review" button only for authorized resolved by 5031bc7

[fess986]

block form when posting review in process resolved by dbb43e9

[fess986]

show error message, if post review fails resolved by 29d7c01