Ignored unnecessary files that are not useful to the users of this module

Improved documentation

Fixed documentation; added missing description of initialization methods

• preferenceFileName is no longer deprecated. Use preferenceDir, fileName and fileExt to set the file name to be used to persist settings, if you want to split the preference directory, filename and extension.

• Specifying only preferenceFileName in options is the same as calling settings.setDefaultPreferenceFilePath()Removed deprecation on preferenceFileName in options

Ignored coverage files, coverage files were accidently pushed to NPM, thereby increasing package size

• update test; fix bugs in tests. Found failing tests
• fixed the "file descriptor instead of file path to create preference file" bug in the source code.

Update docs

• Improved documentation
• Fixed bug in callback-based methods, an error occurs while the user clears all data in the preference file
• Fixed bug while writing to a non-default preference file
• getTempPreferenceOptionalFilePath() and setDefaultPreferenceFilePath() now return normalized paths

• optimized code
• add default intialization require().defaults
• add getTempPreferenceOptionalFilePath()
• improved documentation

fix docs