refactor "PreferencesModifier"

[kazurayam]

in v0.2.7, i have

• https://github.com/kazurayam/webdriverfactory/blob/0.2.7/src/main/groovy/com/kazurayam/webdriverfactory/chrome/ChromePreferencesModifier.groovy

• https://github.com/kazurayam/webdriverfactory/blob/0.2.7/src/main/groovy/com/kazurayam/webdriverfactory/chrome/ChromePreferencesModifiers.groovy

A preferences is just a Map<String, Object>, not specific to Chrome. Therefore it should be moved to the higher level of package and renamed

• com.kazurayam.webdriverfactory.chrome.ChromePreferecesModifier => com.kazurayam.webdriverfactory.PreferencesModifier

This is good to avoid code duplication in Chrome and Firefox

However, the "PreferencesModifiers" are unique e to Chrome and Firefox each, so they should be renamed , in the same page, to

• com.kazurayam.webdriverfactory.chrome.ChromePreferecesModifiers => com.kazurayam.webdriverfactory.chrome.PreferecesModifiers
• com.kazurayam.webdriverfactory.firefox.FirefoxPreferecesModifiers => com.kazurayam.webdriverfactory.firefox.PreferecesModifiers

[kazurayam]

It is not a good idea to have "PreferencesModifiers" class in 2 different packages. It is better to keep them named "ChromePreferencesModifies" and "FirefoxPreferencesModifies"

[kazurayam]

I moved com.kazurayam.webdriverfactory.chrome.PreferencesModifier to com.kazurayam.webdriverfactory.PreferencesModifier.

When I restarted working on Firefox, I found it ugly. A single class PreferencesModifier is shared by Chrome and Firefox together, which looks ugly.

I feel, better to seperate it into 2 for Chrome and FIrefox each