Add translate & scale optimizations

Something to do during a meeting. The translate peephole will probably be useful (mainly for removing useless commands). The scale optimization - not so much.

Executing desk_amazon.skp		5: 11
Executing desk_baidu.skp		5: 2
Executing desk_blogger.skp		5: 15
Executing desk_booking.skp		5: 3
Executing desk_br337.skp		5: 4
Executing desk_chalkboard.skp		5: 2 6: 1
Executing desk_css3gradients.skp	5: 2
Executing desk_ebay.skp			5: 3
Executing desk_espn.skp			5: 6
Executing desk_facebook.skp		5: 2
Executing desk_gmailthread.skp		5: 2
Executing desk_googleplus.skp		5: 42
Executing desk_googlespreadsheet.skp	5: 2
Executing desk_googlespreadsheetdashed.skp	5: 2
Executing desk_gws.skp			5: 2
Executing desk_linkedin.skp		5: 3
Executing desk_pinterest.skp		5: 3
Executing desk_pokemonwiki.skp		5: 2
Executing desk_sfgate.skp		5: 12
Executing desk_techcrunch.skp		5: 9
Executing desk_twitter.skp		5: 3
Executing desk_weather.skp		5: 16
Executing desk_wordpress.skp		5: 4
Executing desk_wowwiki.skp		5: 81
Executing desk_yahooanswers.skp		5: 3
Executing desk_yahoogames.skp		5: 8
Executing desk_yahoonews.skp		5: 8
Executing desk_yahoosports.skp		5: 18
Executing desk_youtube.skp		5: 5
Executing mobi_wikipedia.skp		5: 2
Executing tabl_androidpolice.skp	5: 3
Executing tabl_cnet.skp			5: 7
Executing tabl_cnn.skp			5: 19
Executing tabl_culturalsolutions.skp	5: 2
Executing tabl_cuteoverload.skp		5: 9
Executing tabl_deviantart.skp		5: 5
Executing tabl_digg.skp			5: 2
Executing tabl_engadget.skp		5: 14
Executing tabl_frantzen.skp		5: 4
Executing tabl_gamedeksiam.skp		5: 4
Executing tabl_gmail.skp		5: 2
Executing tabl_googleblog.skp		5: 25
Executing tabl_googlecalendar.skp	5: 3
Executing tabl_gspro.skp		5: 10
Executing tabl_hsfi.skp			5: 26
Executing tabl_mercurynews.skp		5: 5
Executing tabl_mlb.skp			5: 18
Executing tabl_mozilla.skp		5: 2
Executing tabl_nofolo.skp		5: 2
Executing tabl_nytimes.skp		5: 4
Executing tabl_onlinewsj.skp		5: 16
Executing tabl_pravda.skp		5: 7
Executing tabl_sahadan.skp		5: 6
Executing tabl_slashdot.skp		5: 9
Executing tabl_techmeme.skp		5: 2
Executing tabl_theverge.skp		5: 22
Executing tabl_transformice.skp		5: 2
Executing tabl_ukwsj.skp		5: 12
Executing tabl_vnexpress.skp		5: 19
Executing tabl_worldjournal.skp		5: 31

opt 5: 569	opt 6: 1

[DerekS, 2013-03-15 16:58:43]

lgtm.  Sorry for the delay, I forget to check appspot for reviews now that most
things are going to the chromium review site.

[robertphillips, 2013-03-17 18:46:46]

committed as r8182