Create methods.avdl

Initial attempt at specifying 2 rpc definitions - read search and readset search.
add namespace
Delete extra newlines
Add missing import line
Remove readsets
Merge remote-tracking branch 'upstream/master' into methods
switch to GA prefix
Merge readgroups and readsets

- removed `comments` in favor of more generic `tags` like on Reads (where comments can be put easily)
- made the id field non-optional
- added some field comments
Remove flowOrder, keySequence, processingProgram
Attempt to fix build
Merge remote-tracking branch 'upstream/master' into sets--to-groups

Conflicts:
	src/main/resources/avro/ga4gh.avdl
1 -> 0 based
Merge pull request #35 from cassiedoll/sets--to-groups

Merge readgroups and readsets

Merging commit based on community consensus.
Merge pull request #26 from cassiedoll/methods

Initial attempt at specifying 2 method definitions - read search and readset search.

Merging based on reaching community consensus.
Merge branch 'master' of https://github.com/ga4gh/ReadTaskTeam
updated style guide for comments