Fix eunit_surefire crash with rebar eunit tests=...
Fix eunit_surefire crash with rebar eunit tests=...

This fixes the following crash:

> =ERROR REPORT==== 20-Jun-2014::16:35:38 ===
> Error in process <0.40.0> with exit value: {function_clause,[{eunit_surefire,escape_suitename,[undefined,[]],[{file,"eunit_surefire.erl"},{line,416}]},{eunit_surefire,write_report,2,[{file,"eunit_surefire.erl"},{line,258}]},{lists,foreach,2,[{file,"lists.erl"},{line,1336}]},{...

K2InformaticsGmbH/rebar,apache/couchdb-rebar,K2InformaticsGmbH/rebar,oubiwann/rebar,matwey/rebar,lrascao/rebar,lrascao/rebar,matwey/rebar,choptastic/rebar,jacktang/rebar,lrascao/rebar,matwey/rebar,norton/rebar,bsmr-erlang/rebar,matwey/rebar,norton/rebar,paulo-ferraz-oliveira/rebar,paulo-ferraz-oliveira/rebar,lrascao/rebar,rebar/rebar,oubiwann/rebar,jacktang/rebar,K2InformaticsGmbH/rebar,choptastic/rebar,bsmr-erlang/rebar,bsmr-erlang/rebar,oubiwann/rebar,lrascao/rebar,bsmr-erlang/rebar,norton/rebar,apache/couchdb-rebar,K2InformaticsGmbH/rebar,rebar/rebar,choptastic/rebar,apache/couchdb-rebar,rebar/rebar,norton/rebar,jacktang/rebar,paulo-ferraz-oliveira/rebar,K2InformaticsGmbH/rebar,matwey/rebar