Allow Array as :argv of chain command

[stesie]

Given a Commandfile like this

command 'configure',
  description: 'executes "configure" to prepare build',
  parameters: {
    cxxflags: { default: "-ggdb -Wall -Wno-write-strings" },
    ldflags: { default: "-ggdb" },
  },
  script:  ...

if I'd like to create a chain "coverage" and set parameter cxxflags to -O0 --coverage and ldflags to --coverage, ... coming from a shell background I intuitivly tried to do this (and after all vagrant run v8-5.8 configure --cxxflags="-O0 --coverage" --ldflags="--coverage" on a shell prompt works):

chain 'coverage',
  commands: [
    { command: 'phpize' },
    { command: 'configure', argv: '--cxxflags="-O0 --coverage" --ldflags="--coverage"' },
    { command: 'clean' },
    { command: 'build' },
    { command: 'test' },
    { command: 'coverage_report' },
  ]

... but this fails.

The reason for this is that argv is simply String.split without a parameter (hence space). So it splits the argv to [ '--cxxflags="-O0', '--coverage"', '--ldflags="--coverage"' ] ... which is obviously wrong.

Since I didn't want to add quotes and escape string parsing I introduced array syntax like this

chain 'coverage',
  commands: [
    { command: 'phpize' },
    { command: 'configure', argv: ['--cxxflags=-O0 --coverage', '--ldflags=--coverage'] },
    { command: 'clean' },
    { command: 'build' },
    { command: 'test' },
    { command: 'coverage_report' },
  ]

[coveralls]

Coverage decreased (-0.2%) to 96.525% when pulling 838b229 on stesie:chain-array-argv into b673fc2 on mneudert:master.

[mneudert]

❤️ 💙 💛 💜 💚

[coveralls]

Coverage decreased (-0.2%) to 96.525% when pulling 445961a on stesie:chain-array-argv into b673fc2 on mneudert:master.