Add getCellInfoCount() and getCurrentCellInfoCount() to CellScanner
Add "Current Cell Info" and "Cell Info Scanned" to main activity
Override equals() and hashCode() for CellInfo
Reword "Cell Info Scanned" and "Current Cell Info" to "Cells Scanned" and "Cells"

"Cell Info" would be confusing to users, and though they're not strictly
speaking "Cells" but rather readings from cells, this seemed a reasonable
compromise.
Merge pull request #320 from keverets/cell-info

Display current and total cell info to the user