Unknown search terms

Replace encrypted_search_terms with localized string to match string in
wp-admin - see
http://en.support.wordpress.com/stats/#search-engine-terms
Fix Y-axis step calculation in graphs

Y-axis calculations previously dictated a set number of ticks, which sometimes led to cells having too much whitespace at the top, or overrunning the top of the graph. This commit allows the number of ticks to adjust to fit the maximum height of the graph.

Each graph cell calculated its maximum height and Y-axis ticks; this commit moves that calculation to the graph background to avoid rerunning those calculations for each cell.
Fix Y-axis start point for graph cells

Removes whitespace under the graph column by adjusting the starting point by one unit.
Merge pull request #52 from wordpress-mobile/issue/11-replace-encrpyted-search-terms-and-sort

Unknown search terms
Merge pull request #53 from jmdodd/issue/32-graph-view-y-axis

Fix Y-axis step calculation in graphs
Merge pull request #55 from jmdodd/issue/54-y-axis-start-point

Fix Y-axis start point for graph cells
Prevent crash when non-date is passed into nicePointName
Made unit test use implicit unwrapped
Merge pull request #56 from wordpress-mobile/issue/51-nice-name-crash

Prevent crash when non-date is passed into nicePointName
Updating podspec to 0.1.3
Correct a divide by zero error causing a crash in CGRect frame later
Updated to use an if statement for more clarity
Merge pull request #57 from wordpress-mobile/issue/51-nice-name-crash

Correct a divide by zero error causing a crash in CGRect frame later
Updated podspec
Merge branch 'develop' of github.com:wordpress-mobile/WordPressCom-Stats-iOS into develop
Fixed crash when switching today/yesterday in rare cases
Merge pull request #58 from wordpress-mobile/issue/50-crash-reload-section

Fixed crash when switching today/yesterday in rare cases
Rolling out new WPiOS Stats pod