Summary
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Have `javac` recognize "10" and "1.10" as a valid arguments for the -source and -target options and 10 as a valid argument for the --release option.

Initially, the "10" arguments will just be aliases for 9 until 10-specific features are added later in the release.

Problem
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With a new JDK release, new source and target values are needed in `javac`,

Solution
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Add javac options -source 10 -source 1.10 -target 10 -target 1.10

Specification
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-source 1.10
The compiler accepts code with features introduced in Java SE 10.
 
-source 10
Synonym for 1.10.
 
-target 1.10
The compiler outputs class files appropriate for the 10 platform.
 
-target 10
Synonym for 1.10.

The default source and target is also updated from 9 to 10.