Update GCTagList.m

修改当文本宽度超过指定限值时，高度并没有自适应的BUG
Update GCTagList.m

tagList的高度即需要加上2倍的VERTICAL_PADDING
Merge pull request #6 from SalesPro/develop

Develop
new feature with custom font for taglist's taglabel.
debug for new feature

update README