ultisnips snippets not working

syntax enable
filetype indent on
set et
set shiftwidth=4
set smarttab
set expandtab
set tabstop=4
set softtabstop=4
set autoindent
set encoding=utf-8 " Necessary to show Unicode glyphs
map <F2> :w\|!python %<cr>

" Wrap at 80 Chars, keep words intact
"set formatoptions+=w
"set tw=80


"" NUMBERS AT THE BEGINNING OF EVERY LINE
set number

"" SETTING FOR USING WOMBAT COLOR SCHEME
"set t_Co=256
"colorshceme wombat256

"" BELOW CODE FOR HIGHLIGHTING ANYTHING AVOBE 80 COLUMNS
"set columns=80
highlight OverLength ctermbg=red ctermfg=white guibg=#592929
match OverLength /\%81v.\+/


"" ALTERNATE TO HIGHLIGHTING OPTION ABOVE
if exists('+colorcolumn')
  set colorcolumn=80
else
  au BufWinEnter * let w:m2=matchadd('ErrorMsg', '\%>80v.\+', -1)
endif

"" VUNDLE STUFF
set nocompatible               " be iMproved
filetype off                   " required!
set rtp+=~/.vim/bundle/vundle/
call vundle#rc()
" let Vundle manage Vundle
" required!
Bundle 'gmarik/vundle'
" My Bundles here:
"
" original repos on github
Bundle "altercation/vim-colors-solarized"
Bundle "scrooloose/syntastic"
Bundle "majutsushi/tagbar"
" for Ultisnips
    Bundle "MarcWeber/vim-addon-mw-utils"
    Bundle "tomtom/tlib_vim"
    Bundle "honza/vim-snippets"
    Bundle "gglanzani/ultisnips-snippets.git"
    Bundle "SirVer/ultisnips"
    let g:UltiSnipsSnippetDirectories=["my_snippets"]
"Bundle 'tpope/vim-fugitive'
"Bundle 'Lokaltog/vim-easymotion'
"Bundle 'rstacruz/sparkup', {'rtp': 'vim/'}
"Bundle 'tpope/vim-rails.git'
" vim-scripts repos
"Bundle 'L9'
"Bundle 'FuzzyFinder'
" non github repos
"Bundle 'git://git.wincent.com/command-t.git'
" ...
filetype plugin indent on     " required!
"
" Brief help
" :BundleList          - list configured bundles
" :BundleInstall(!)    - install(update) bundles
" :BundleSearch(!) foo - search(or refresh cache first) for foo
" :BundleClean(!)      - confirm(or auto-approve) removal of unused bundles
"
" see :h vundle for more details or wiki for FAQ
" NOTE: comments after Bundle command are not allowed..

" FOR SOLARIZED COLOR THEME
set t_Co=256
set background=light
let g:solarized_termcolors=256
colorscheme solarized

""" FOR POWERLINE (MUST COME LAST, FOR SOME REASON)
set rtp+=$HOME/.local/lib/python2.7/site-packages/powerline/bindings/vim/
" Always show statusline
set laststatus=2
" Use 256 colours (Use this setting only if your terminal supports 256 colours)
"set t_Co=256
set encoding=utf-8 " Necessary to show Unicode glyphs
let g:Powerline_symbols = 'fancy'