Revert back to JDK 1.7 due to regression in GATK 3.3

.idea/libraries/Maven__com_baqend_bloom_filter_1_02.xml

.idea/libraries/Maven__com_google_code_gson_gson_2_2_4.xml

.idea/libraries/Maven__com_google_guava_guava_18_0.xml

...libraries/Maven__org_apache_commons_commons_pool2_2_2.xml

.idea/libraries/Maven__redis_clients_jedis_2_5_1.xml

.idea/misc.xml

biopet-framework/BiopetFramework.iml

biopet-framework/pom.xml

.../src/main/scala/nl/lumc/sasc/biopet/tools/WipeReads.scala