Strange VerifyErrors for java-fogbugz in the recent version

Hi
after installation of the most recent version of fogbugz-plugin
I get this in build log

```
00:00:05.223 FATAL: Expecting a stackmap frame at branch target 19
00:00:05.223 Exception Details:
00:00:05.223 Location:
00:00:05.223 org/paylogic/fogbugz/FogbugzCase.addTag(Ljava/lang/String;)V @5: ifne
00:00:05.223 Reason:
00:00:05.223 Expected stackmap frame at this location.
00:00:05.223 Bytecode:
00:00:05.223 0000000: 2a2b b600 619a 000e 2ab4 0029 2bb9 0064
00:00:05.223 0000010: 0200 57b1
00:00:05.223
00:00:05.224 java.lang.VerifyError: Expecting a stackmap frame at branch target 19
00:00:05.224 Exception Details:
00:00:05.224 Location:
00:00:05.224 org/paylogic/fogbugz/FogbugzCase.addTag(Ljava/lang/String;)V @5: ifne
00:00:05.224 Reason:
00:00:05.224 Expected stackmap frame at this location.
00:00:05.224 Bytecode:
00:00:05.224 0000000: 2a2b b600 619a 000e 2ab4 0029 2bb9 0064
00:00:05.224 0000010: 0200 57b1
00:00:05.224
00:00:05.225 at org.paylogic.fogbugz.FogbugzManager.constructCaseFromXmlNode(FogbugzManager.java:181)
00:00:05.225 at org.paylogic.fogbugz.FogbugzManager.searchForCases(FogbugzManager.java:163)
00:00:05.225 at org.paylogic.fogbugz.FogbugzManager.getCaseById(FogbugzManager.java:122)
00:00:05.225 at jenkins.plugins.fogbugz.buildwrappers.FogbugzEnvironmentWrapper.setUp(FogbugzEnvironmentWrapper.java:116)
00:00:05.225 at hudson.model.Build$BuildExecution.doRun(Build.java:156)
00:00:05.225 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:537)
00:00:05.225 at hudson.model.Run.execute(Run.java:1741)
00:00:05.225 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
00:00:05.225 at hudson.model.ResourceController.execute(ResourceController.java:98)
00:00:05.225 at hudson.model.Executor.run(Executor.java:408)
00:00:05.227 Recording test results
```

So something goes wrong in https://github.com/paylogic/java-fogbugz library (which i maintain)
but i can't figure out what exactly. It was built via maven compiler plugin in strict mode (all warnings on) and java 7 as target, everything seems fine. But when bundled with this plugin it complains about frames.

can you please help resolving this?
@ndeloof @jglick

Start with org.paylogic.fogbugz.FogbugzCase.addTag and the FogbugzManager.java call sites at lines 122, 163, and 181 shown in the stack trace. Compare the java-fogbugz artifact built by Maven with the version bundled in fogbugz-plugin, then reproduce the VerifyError using the reported Java 7 target. Done means the packaging or build cause is identified and a compatible correction is verified.

Written by the indexing model from the issue text.