Fix: add ignored dirs configuration

[ligangty]

Current ignore_patterns only address the file names, but not the whole
direcotries. It's a little hard to use this regex patterns to decide if
the whole path should be ignored by the pattern.
This pr added a new configuration "ignore_dirs", which means all files
in these ignored_dirs will be ignored for uploading and removing,
wherever these dirs located (root or the sub folder)

[ligangty]

@jdcasey I found that the GA uploading contains the .index .meta and .nexus folders. This is because the ignore_patterns only works for file names, but not the whole path. This PR is fixing the problems.
For the uploaded stuff in these ignored folder, I think we can remove it manually later, and just update the root index.html.

[coveralls]

Pull Request Test Coverage Report for Build 1767940684

• 27 of 27 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 79.001%

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Totals
Change from base Build 1767930659:	0.3%
Covered Lines:	1328
Relevant Lines:	1681

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💛 - Coveralls

[ligangty]

Will hold this as we decide to ignore this fix in current phase.

[ligangty]

This fix is not needed anymore. Closed.