Update README.md
chore(build): make bower-material include themes
refactor(theming): deregister $rootScope.$watch
style(backdrop): .opaque -> .md-opaque
style(bottomSheet): .list -> .md-list
style(content): .md-content-padding -> .md-padding
style(dialog): .dialog-content -> md-content, .dialog-actions -> md-actions
style(list): remove unused class
style(progressCircular): add md- prefix to all internal classes
style(progressLinear): use md- prefix for internal classes
style(checkbox): remove unused class
style(sidenav): .closed -> .md-closed, .locked-open -> .md-locked-open
style(slider): use md- prefix for internal classes
style(sticky,subheader): .sticky-no-effect -> .md-sticky-no-effect
style(docs): make demo-source background extend with code
style(tabs): use md- prefix on internal classes
style(toast): prefix internal classes
style(tooltip): use md- prefix for internal classes
style(bottomSheet): .list -> md-list, .grid -> .md-grid, .has-header -> .md-has-header, .grid-text -> .md-grid-text
style(sidenav): make backdrop inherit theme properly