added project skeleton
added IntelliJ IDEA project files
removed IntelliJ IDEA files from tracking
implemented code for 'instance' spec
implemented code for 'parsing xml response' spec
simplified nodes to array element evaluation
implemented code for 'constructing URI' spec
implemented code for 'service connection' spec
Merge branch 'hw1.5'

* hw1.5:
  implemented code for 'service connection' spec
  implemented code for 'constructing URI' spec
  simplified nodes to array element evaluation
  implemented code for 'parsing xml response' spec
  implemented code for 'instance' spec
  removed IntelliJ IDEA files from tracking
  added IntelliJ IDEA project files
  added project skeleton