Jetpack: Stats: Stop calling array_map( 'esc_html' ) on an array that could contain something other than just strings.  It can kick a Notice if WP_DEBUG

WHEREAS function stats_get_options() can contain an array at $options['count_roles'] (stats.php:213 r706011)
WHEREAS function stats_get_blog() ends with: return array_map( 'esc_html', $blog ); on the contents of stats_get_options()
WHEREAS function esc_html() runs wp_check_invalid_utf8() on strings passed to it (wp-includes/formatting.php:2719)
WHEREAS function wp_check_invalid_utf8() begins by casting the passed in variable to a string (wp-includes/formatting.php:511)
THEREFORE:
Notice: Array to string conversion in wp-includes/formatting.php on line 511
Warning: Cannot modify header information - headers already sent by (output started at wp-includes/formatting.php:511) in wp-content/plugins/jetpack/class.jetpack.php on line 3581
Warning: Cannot modify header information - headers already sent by (output started at wp-includes/formatting.php:511) in 
wp-includes/pluggable.php on line 899


git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@800497 b8457f37-d9ea-0310-8a92-e5e31aec5664