themes.xml: Improve control visibility in dark theme
values-zh/strings.xml: Update Chinese (Simplified) translation
.gitignore: OCD fixes :)
values-zh/strings.xml: "Above", not "At the top of"
values-zh/strings.xml: "Open" -> "Close", "Drawer navigation" -> "Navigation drawer"
Merge pull request #178 from zhaofengli/master

UI tweak + Chinese translation update
use the jsoup library by gradle dependency
fix possible crashes
add eye icon again instead of the envelop one
remove card views to follow material design guidelines
add tip to the bottom of the list
improve tip sentence