improve timer implementation.
refactor AllTries bench.
add test code.
Merge branch 'master' of https://github.com/takawitter/trie4j.git
#6 fixed.
back to java1.7
refactoring patricia tries.
Merge remote-tracking branch 'origin/refactor-patriciatrie' into
enh-refactor-tail

Conflicts:
	trie4j/test/org/trie4j/AllTries.java
	trie4j/test/org/trie4j/doublearray/TailDoubleArrayWithConcatTailBuilderTest.java
	trie4j/test/org/trie4j/doublearray/TailDoubleArrayWithSuffixTrieTailBuilderTest.java
	trie4j/test/org/trie4j/test/WikipediaTitles.java
refactor test classes (move package).