Consider minimal Java version

[keilw]

Looking at ideas for Android support like JavaMoney/javamoney-shelter#17 we should ensure, the BPs also work there. API even Java ME Embedded 8, too (which is largely compatible with Java SE 7 anyway)

[atsticks]

Current first release is building/compatible with Java SE 7. Basically with replacing the diamond operators with corresponding explicit entries should do the job rendering it compatible with Java 6.

[atsticks]

All the Objects refs must also be removed, so I propose to stick with Java 7.

[keilw]

What refs or classes do you mean?

@msgilligan already looked into Android support. As long as we don't break anything on Android (see http://stackoverflow.com/questions/7153989/java-7-language-features-with-android/13550632#13550632) Java 7 could generally work.