Propose running addon-validator with a docker

I've created a docker container using the setup process to speed up the process of running the validator against an xpi file easily.
Fix docker command to render as code
Updated amo-validator with hashes for SDK version 1.17
Merge pull request #237 from KWierso/addsdk1.17

Updated amo-validator with hashes for SDK version 1.17
Using link to docker instructions

Instead of putting the command to avoid future support requests.
Merge pull request #236 from marceloandrader/master

Link to docker setup instructions
namepsace_pollution ~> namespace_pollution
Add option to skip warnings from spidermonkey (bug 934388)
Merge pull request #241 from yohanboniface/bug-934388-skip-stderr

Add option to skip warnings from spidermonkey (bug 934388)
unchnged_entities ~> unchanged_entities
Don't require install.rdf if there is a package.json (bug 1037201)
Test errors for no isntall.rdf and package.json
PEP8 installrdf files
Test package.json name
Require name be present in package.json
Fix old "tests" with no assertions
Validate package.json id field
Valdate version in package.json
Cleanup package.json validation
Use partials for partial functions