update .gitignore to ignore backup files and eclipse generated files.
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Key: BIGTOP-322
URL: https://issues.apache.org/jira/browse/BIGTOP-322
Project: Bigtop
Issue Type: Improvement
Components: General
Affects Versions: 0.3.0
Reporter: Jonathan Hsieh
Attachments: bigtop-322.patch
Adding a few signatures to the .gitignore.
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