Update build instructions to use a local phing

No need for a global install of phing anymore, as it's now a dev
composer dependency.
Metadata updates from Google v6.1.1 (r669)

* Metadata changes:
  - Updated phone metadata for region code(s):
    AF, AG, AI, AS, BB, BF, BM, BS, CA, CN, CR, DM, DO, DZ, FR, GD, GU, IN, JM,
    KH, KN, KW, KY, LC, MN, MP, MS, NG, NI, PH, PR, SX, TC, TT, US, VC, VG, VI
  - Updated short number metadata for region code(s): AL
  - New geocoding data for country calling code(s): 1346 (en), 1959 (en)
  - Updated geocoding data for country calling code(s):
    33 (en, fr), 352 (de, en, fr), 355 (en)
  - New carrier data for country calling code(s): 505 (en)
  - Updated carrier data for country calling code(s):
    63 (en), 91 (en), 93 (en), 234 (en)