Fix for evaluating whether tests are running. Affects UI
Fix for evaluating whether tests are running. Affects UI

There's definitely some change that occured, I'm guessing from Vim 7.3
to 7.4 unless it's a change in Python? However, that doesn't excuse my
sloppy coding.

`vim.eval("exists('g:vader_file')")` evaluates to 0 or 1. Previously
using `not` in front of this would get a `true` or `false` as
appropriate, but now this no longer works.

I'm guessing before that `vim.eval(...)` returned a integer and now it's
a string? I should have explicity converted this to an integer from a
string anyway and tested for equality to a value as opposed to relying
on python to interpret 0 and 1 as False and True.

Fixes #52

mrtazz/simplenote.vim,sanchon/simplenote.vim,sanchon/simplenote.vim,yuex/simplenote.vim,kidpixo/simplenote.vim,mrtazz/simplenote.vim