Added post_filters plugin
Added post_filters plugin

Plugins that extend PostFilter will get three
additional methods: pre_render, post_render and
post_write. These will be called when every page
or post is processed and allows for the plugin to
modify the post/page object directly to modify
the output beyond what can be done with just
markup.
Whatthefoxsays/docs,sendgrid/docs,awwa/docs,GilUpstream/docs,hardikjain29/docs,sendgrid/docs,L2G/docs,L2G/docs,ksigler7/docs,ksigler7/docs,hardikjain29/docs,Aonepathan/docs,Aonepathan/docs,Zaftula/docs,bogdanboss/docs,Aonepathan/docs,ksigler7/docs,jacobmovingfwd/docs,GilUpstream/docs,Ranhiru/docs,Zaftula/docs,Ranhiru/docs,katieporter/docs,GilUpstream/docs,katieporter/docs,jacobmovingfwd/docs,L2G/docs,katieporter/docs,taz77/docs,bogdanboss/docs,taz77/docs,hardikjain29/docs,taz77/docs,Whatthefoxsays/docs,awwa/docs,Aonepathan/docs,jacobmovingfwd/docs,Whatthefoxsays/docs,bogdanboss/docs,Zaftula/docs,taz77/docs,jacobmovingfwd/docs,bogdanboss/docs,GilUpstream/docs,sendgrid/docs,Zaftula/docs,Ranhiru/docs,Aonepathan/docs,jacobmovingfwd/docs,Ranhiru/docs,GilUpstream/docs,awwa/docs,katieporter/docs,L2G/docs,hardikjain29/docs,L2G/docs,awwa/docs,Zaftula/docs,awwa/docs,katieporter/docs,bogdanboss/docs,taz77/docs,hardikjain29/docs,Ranhiru/docs