Add pushbullet support, update docs

First of all, finally some usefull graphite notiffier, that does not require having configuration for events in a database. I added support for pushbullet notifier. Pushbullet is cool, because it's free :) 
pushbullet.py requires requests>=1.0

On Tue, Sep 23, 2014 at 6:45 PM, Jose Diaz-Gonzalez <
notifications@github.com> wrote:

> In requirements.txt:
>
> > @@ -2,5 +2,6 @@ Jinja2==2.6
> >  PyYAML==3.10
> >  pagerduty==0.2.1
> >  redis==2.6.2
> > -requests==0.14.0
> > +requests==2.4.1
>
> Why this change?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/seatgeek/graphite-pager/pull/27/files#r17920925>.
>



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