Merge pull request #11 from mkeung/master

update reddit tipping section
updated mac wallet content and images
updated browser wallet content
updated scam content
updated index content
updated all images to be responsive
updated currency conversion content
updated exchange content
add learn more section to index
Merge remote-tracking branch 'kbouw/master'
updated mac wallet content
updated mac wallet content
update index and wallet content with learn more
Merge remote-tracking branch 'kbouw/master'