Methods in ReadYamlMapping and unit tests

[amihaiemil]

PR for #73

Added OrderedYamlLines decorator, to separate concerns, because having RtYamlLines always ordering the lines is not correct; we don't always want the lines to be ordered - for instance, method ReadYamlMapping.string(YamlNode) doesn't work right if the lines are ordered.

Also, when calling ReadYamlMapping.indent() (which prints the lines), the lines should not be ordered.

[coveralls]

Coverage increased (+5.0%) to 84.762% when pulling 05ff0c7 on 73 into 05099b5 on master.

[coveralls]

Coverage increased (+5.0%) to 84.762% when pulling 05ff0c7 on 73 into 05099b5 on master.

[amihaiemil]

@SherifWaly Just for information, you can look here if you want to see why I added OrderedYamlLines

[amihaiemil]

@rultor merge pls

[rultor]

@rultor merge pls

@amihaiemil OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge pls

@amihaiemil Done! FYI, the full log is here (took me 1min)