#86 Loggable allows precision of elapsed time to be specified
#86 Precision as number of fractional digits
Merge remote-tracking branch 'origin/master' into 86

Conflicts:
	src/main/java/com/jcabi/aspects/Loggable.java
	src/test/java/com/jcabi/aspects/LoggableTest.java
#86 Removed JDK6 incompatible library
#86 Checkstyle error fixes
#86 Call super