add \n and \t support to string declarations
add lower filter. resolves #16
add nl2br filter. resolves #17
Add number format filter. resolves #18
add slice filter. resolves #24
Add round filter. resolves #23
add reverse filter. resolves #22
add replace filter. resolves #21
add mrege filter. resolves #19
add floor filter
Add ceil filter
update readme for new filters
Add relative filter. resolves #57
decruft relative filter
Merge pull request #58 from golavender/filters

add a bunch of filters