Pull in READMEs for connectors, components

[crandmck]

We should use the same technique that we currently use to fetch the example repo READMEs to get the READMEs for all the data source connectors and the components. Also look at any other READMEs we should include into the docs.

This may require some minor modifications to the get-readmes code to allow for a second repos.json file in the _data directory.

[crandmck]

I've enhanced get-readmes and we now have all the READMEs in the repo. Unfortunately, there are some wrinkles:

• Some don't contain the information that they should (I made dev move it to Confluence... doh!)
• Some have formatting errors.

Work is underway to correct these. See http://loopback.io/doc/en/lb2/tag_readme.html for list of all pages currently transcluding READMEs.

[crandmck]

We need to consolidate the docs and READMEs for several connectors; here are the issues:

• Consolidate MS SQL connector doc #155
• Consolidate MySQL connector doc #156
• Consolidate Oracle connector doc #157
• Consolidate PostgreSQL connector doc #158
• Consolidate Redis connector doc #159
• Consolidate REMOTE connector doc #160

@Amir-61 I will do this work, but I'll ask you to review the PRs.

[crandmck]

Going to close this since there are issues for the each specific connector/component.