Added more accurate .gitignore regex patterns.
Added more accurate .gitignore regex patterns.

 - Removed preceding slashes so patterns match the relative paths being provided in setFileSystemIndexFilter().
 - Made "." characters static, and "*" dynamic for characters other than directory separators.
 - Wrapping the regex in begin-/end-string characters or directory separators.
DimitrK/exclude-indexing-filetree