Merge pull request #4 from XxShenglixX/master

Merge and remodify Dictionary.h, Dictionary.c
Added new function addDataToDictionary
Changed travis.yml to test only Decompression.c
Modified function addDataToDictionary and added some new tests for it
Changed travis to test Dictionary.c
Modified the function destroyDictionary and change travis to test all
Changed back travis to test only Dictionary.c
Modified destroyDictionary function and test again with travis
Change travis to test all
Added isDictionaryEmpty(),LZ78_Compresssor(),LZ78_Output and test code
Solve merge conflict