PbxprojHelper Versions Save

Fix array content.

Fix array diff.

Fix command line tool bug. Issue:https://github.com/yulingtianxia/pbxprojHelper/issues/12

1. Matching the corresponding JSON file
2. Fix permission of accessing files.

"Revert" is a reverse operation of "Apply". It doesn't use backups anymore!

When you click "Apply" button, pbxprojHelper will read data from files again. This behavior is important.

1. fix bug
2. add travis ci
3. support swift package
4. update readme

Now you can use pbxproj as a command line tool in terminal!

You should move pbxproj to /usr/local/bin/, so you can execute pbxproj command conveniently in terminal.

Here is the Usage:

Usage: pbxproj [command_option] file
Command options are (-convert is the default):
-compare modified_file -o path          compare modified property list file with property list file and generate a json result at the given path
-apply json_file                        apply a json file on property list file
-revert                                 revert property list file to latest backup
-convert                                rewrite property list files in xml format

Finish base funtions.