GREUtils.using bugfixed

GREUtils.using namspace from optionally associating a context with the
namespace, if optionally context not found, using namepace from
GREUtils.context (javascript modules context)
Updated API documentation
Committer: Irving <Irving Hsu@.(none)>
Merge branch 'master' of git@github.com:vivipos/greutils
On branch master
Changes to be committed: removed unnecessary blank lines in function comments
	modified:   src/core.js
Documentation clean-up in preparation for alpha release
On branch master
Changes to be committed: removed unnecessary comment lines
	modified:   src/utils.js
GREUtils.Dialog.openFilePicker bugfixed.
Merge branch 'master' of git@github.com:vivipos/greutils
Revised API documentation in preparation for alpha release
On branch master
Changes to be committed: documentation
	modified:   src/dir.js
	modified:   src/file.js
	modified:   src/json.js
	modified:   src/utils.js
Merge branch 'master' of git@github.com:vivipos/greutils
support GREUtils.File.copy with newname
Merge branch 'master' of git@github.com:vivipos/greutils
define / using bugfixes, thread bugfix, file exists bugfixed.
GREUtils.Dialog.openWindow support support parent window argumemnt
Updated documentation
	modified:   src/file.js
GREUtils bugfixed.
Merge branch 'master' of git@github.com:vivipos/greutils
many bugfixed
major bugs fixed
add GREUtils.gc for garbage collection
GREUtils.Gzip package.
        add deflate/inflate functions