Implement Glob.matchAsPrefix()

This also allows matchesFull() to be used with Glob patterns.
Add center to quiver.strings
Add Glob.matchAsPrefix() to glob test.
Pad extra char on right instead of left per ruby
Add quiver.streams.concat
Fix HashBiMap to match Map<K, V> spec
Shorthand syntax for putIfAbsent
Make createTimer assignable to CreateTimer and add tests
Improve docs
Remove expectAsync usage
Add duration unit constants to quiver.time
Merge pull request #93 from seaneagan/duration_unit_constants

Add duration unit constants to quiver.time
Merge pull request #89 from seaneagan/fix_create_timer

Fix CreateTimer by adding Duration param and add tests
Merge pull request #86 from seaneagan/streams_concat

Add quiver.streams.concat
Merge pull request #88 from codelogic/patch-1

Fix HashBiMap to match Map<K, V> spec
Bimap: Only hash once in putIfAbsent common case.
Merge pull request #72 from tonio-ramirez/master

Implement Glob.matchAsPrefix()
Merge pull request #94 from jtmcdole/treeset

TreeSet collection
Remove rightFill,, add spaces after ifs
Fix minor typo in README