Merge branch 'dev' into features/jsonpayload

Conflicts:
	pipeline/all_specs_test.go
Add more recent work to the changelog.
Issue #292 Fix Windows dependencies
Issue #292 Update install documentation
Issue #292 Don't preserve the generated output
Issue #292 Update prerequisites, and a Windows dependancy target
added tests for JsonPayloadDecoder
Merge branch 'dev' into features/jsonpayload
Specify 0.3 release date.
Bump version #s from 0.3 to 0.4 on dev branch after cutting versions/0.3 branch.
Issue #292 Setup the GOBIN environment variable
Merge branch 'features/cmake' of github.com:mozilla-services/heka into features/cmake
Issue #292 Remove optional cmake/plugin_loader.cmake file

- plugin_loader.cmake should not be checked in and it should
be ignored by git
added kibana formatter
add option to use timestamp when writing to idx
Add a Mysql slow query log example

This is an example of multi line log entry processing (sessionization)
using a Lua sandbox.
Add mention of the mailing list and irc channel in the readme so it'll show up on the
github landing page.
Merge pull request #330 from mozilla-services/bobm

Add a Mysql slow query log example
Issue #292 More doc updates

- Remove references to heka-build
- Explicitly state that the build script resets the Go environment
- Fix typo in 'make package'
Update readme