Update writer constructor
Fix code isFileOk -> isFileOk()
rename getAsString() to saveString() in order to be consistent with saveFile()
Fix issue #4
Fix issue #4 & #5
First parameter for loadString should be string rather than resource
Rename method isFileOk -> isFileReady
Base class & unimplemented methods should be marked as abstract
Fix method name conflict
str_getcsv instead of fgetcsv
Improve XMLWriter datatype identifier
added autoload to composer.json
fixed instance variable bug
fixed file type check bug
added return values to xml parser
Merge pull request #7 from McRip/merge

Bugfixes
Preparing support for XLSX format
Merge branch 'master' of github.com:faisalman/simple-excel-php