Update javadoc.

--HG--
branch : r1.2.0
Update javadoc.

--HG--
branch : r1.2.0
Some reformatting.

--HG--
branch : r1.2.0
Merge '10f59cb'.

--HG--
branch : r1.2.0
Update download information in README.md file.

--HG--
branch : r1.2.0
Update Gradle version in README.md.

--HG--
branch : r1.2.0
Some code re-formatting.

--HG--
branch : r1.2.0
Some code re-formatting.

--HG--
branch : r1.2.0
Convert absolute image file name to relative one.

--HG--
branch : r1.2.0
Update Gradle version in manual.

--HG--
branch : r1.2.0
Update javadoc.

--HG--
branch : r1.2.0
Some code re-formatting.

--HG--
branch : r1.2.0
Refactor to use one primary constructor.

--HG--
branch : r1.2.0
Update javadoc.

--HG--
branch : r1.2.0
Change the mercurial URL in manual.

--HG--
branch : r1.2.0
Using java 7 multi-catch feature.

--HG--
branch : r1.2.0
Using IndexStream.Random method without Random parameter.

--HG--
branch : r1.2.0
Using primary-constructor pattern.

--HG--
branch : r1.2.0
Some code re-formatting.

--HG--
branch : r1.2.0
Improvements in Random64 class.

--HG--
branch : r1.2.0