Support "dalvik" android strings

[jacobpierce]

reports browser name & browser version unknown while running from dalvik VM

dalvik/2.1.0 (linux; u; android 6.0; e5633 build/30.2.b.0.100)
dalvik/1.6.0 (linux; u; android 4.4.2; lenovo a5500-h build/kot49h)
dalvik/1.6.0 (linux; u; android 4.4.2; ixion xl145 snatch build/kot49h)

[jacobpierce]

---- summary ----
total user agents evaluated: 57092
total with unknown attributes: 903 0.015816577
requests with no UA string: 57 0.0009973928
---- details ----
browser name unknown: 84 0.0014713095
browser version unknown: 160 0.0028024942
platform unknown: 20 0.00035031178
os name unknown: 25 0.0004378897
os version unknown: 831 0.014555454
device unknown: 9 0.0001576403