Fixed a Unit Test Bug

[yohanthshetty]

Overview:
.ebignore includes symlinked files in ignored directories
Fixed Issue#69

Description of changes:
Fixed bug where a folder mentioned in .ebignore file was being included in the final code.zip on running eb deploy. This was due to the presence of a symlink within that folder.

Changes

1. Added method to check if current file being checked for ignore/include exists in the ignore_list.
2. Updated the Pathspec library to latest version i.e. 0.10.1
3. Changed method in get_ebignore_list() function from match_tree to math_tree_entries.

.ebignore contents = ignore/ , Before: we were getting ignore/.... but not just ignore/ After: we get ignore/... and just ignore/ too.

4. Updated Unit test case.

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