uses pthreads with jniEnv to call logger funtn in java from C
adds account register native api and attempts retrieving values from POJO
extracts code into function
introduces dummy calling screen on successful registration
introduces dummy jni for phone call
implements jni phone call method
adds android permissions.. mostly redundant for time being
introduces sipsdk class to collect all the sip functionality
introduces answer call api
fixes bug: proxy was not set properly
separates pjsua_init from account addition
refactoring: adds transport during init rather than while acct addition
refactors logging
correcting the usages of logging
declares n initialze javaVM in separate file
adds incoming call related callbacks
Merge pull request #1 from rahul-pl/f_register_screen

register screen