#213: Introduced the options allowNewAbstractElementsInMinor and allowBinaryCompatibleElementsInPatch in SemverOut

[rhierlmeier]

From our point of view the SemanticVersion implementation of japi-cmp is too restrictive. In our company we drive a different policy.

• We allow in a patch that new binary compatible elements are added
• We allow in minor version changes the new abstract elements are added.

I introduced with this pull request the options allowNewAbstractElementsInMinor and allowBinaryCompatibleElementsInPatch in the class SemverOut.

In the japicmp-maven-plugin these options change be configured in this way:

<plugin>
    <groupId>com.github.siom79.japicmp</groupId>
    <artifactId>japicmp-maven-plugin</artifactId>
    <version>0.12.1-SNAPSHOT</version>
    <configuration>
        <parameter>
            <breakBuildBasedOnSemanticVersioning>true</breakBuildBasedOnSemanticVersioning>
            <semanticVersioning>
                <allowBinaryCompatibleElementsInPatch>true</allowBinaryCompatibleElementsInPatch>
                <allowNewAbstractElementsInMinor>true</allowNewAbstractElementsInMinor>
            </semanticVersioning>
        </parameter>
    </configuration>
</plugin>

[siom79]

Another solution has been implemented in commit 4498e7720d319f0fab98bd31d970a0ea05b17be1.