add docs for csv formatter
update Ruby to 2.1.4
update the plugin overview pages
get rid of v1 for now, set up v0.12
deleting the v1 symlinks
update the v0.12 tests and remove the offensive blank file
docs for in_dummy

if in_dummy is available in v0.10 branch, move this and symlink
fix indent for in_dummy
filter plugin docs initial commit
update the plugin overview pages
update the plugin development for v0.10

- make the plugin taxonomy easier to see
- remove the obsolete section about in_tail parsers
add the v0.12 version of the plugin-development docs
fix filter-plugin-overview indentation
add a link to the plugin development page
in_dummy for v0.10
Merge pull request #144 from takumakanari/add-csv-formatter

add docs for csv formatter
add a note about Amazon Linux
hide the confusing warning for new features
refactor and update format parameter expl