Google's Android platform reached a new milestone in February: The platform gained a majority share of the nation's smartphone market, according to the latest monthly report from metrics company comScore Inc.  Android's market share rose to 50.1 percent in the three months ending in February, up 3.2 percentage points from the three months ending in November and 17 percentage points since February 2011. Meanwhile, the market share of Apple's iPhone platform rose to 30.2 percent, up 1.5 percentage points from the three months ending in November and 5 percentage ponts from February 2011. Combined, Google and Apple accounted for just over 80 percent of the smartphone market in February. The market share of Research in Motion's BlackBerry declined by the same amount Android gained, 3.2 pe...