Update vital and add Random module
Use Random module of vital
Add g:threes#data_directory variable

This has not been used yet.
Record steps at internal
Add record.vim

It is temporary for details.
Save records on gameover
Change format of steps

[-1, 0] => 0
[1, 0]  => 1
[0, -1] => 2
[0, 1]  => 3
Move canvas to dependence file
Move renderer to dependence file
Change play buffer style
norelativenumber
Load records
Add :ThreesShowRecord
Add some tests
v1.5