add buildenv to interactively build program

- added s3cmd to upload archives
- to upload archives, you need to have the following env variables setup in
  the host
  - AWS_ACCESS_KEY
  - AWS_SECRET_KEY
  - AUTOPARTS_HOST
  - AUTOPARTS_BUCKET
setup env before running the shell
Updated README.MD and included links to docs/contributing.md and also docs/example-app.rb

The contributing files have been added as a guide to building a new part.
ignore unknown packages in "status" command
fixed apache2 not restarting after force quit/reboot
updated post install documentation in example-part.rb
Merge pull request #74 from nitrous-io/dockerbuild

add buildenv to interactively build program
package.rb: Addes support for .tar.xz files
Added libmad package
Add InfluxDB
Add terminating newline
add protobuf, set it as dependency for influxdb
add flex package
Set timeout of 15s for parts update
add influxdb
add bison pkg
add leveldb
add snappy
Influxdb -> InfluxDB
add python2