Make microtime a devDependency again about pbkdf2

[calvinmetcalf]

and done

[pirelenito]

If you think it is fine, I can prepare a PR.

[ticolucci]

On yarn install of a project using webpack I got an error.
Big errors are scary =P
(even when there's a message that it's ok to ignore it)

Console:

[4/4] Building fresh packages...
warning Error running install script for optional dependency: "/opt/le_project/client/node_modules/microtime: Command failed.\nExit code: 1\nCommand: sh\nArguments: -c node-gyp rebuild\nDirectory: /opt/le_project/client/node_modules/microtime\nOutput:\ngyp info it worked if it ends with ok\ngyp info using [email protected]\ngyp info using [email protected] | linux | x64\ngyp http GET https://nodejs.org/download/release/v7.8.0/node-v7.8.0-headers.tar.gz\ngyp http 200 https://nodejs.org/download/release/v7.8.0/node-v7.8.0-headers.tar.gz\ngyp http GET https://nodejs.org/download/release/v7.8.0/SHASUMS256.txt\ngyp http 200 https://nodejs.org/download/release/v7.8.0/SHASUMS256.txt\ngyp info spawn /usr/bin/python2\ngyp info spawn args [ '/usr/share/yarn/node_modules/node-gyp/gyp/gyp_main.py',\ngyp info spawn args 'binding.gyp',\ngyp info spawn args '-f',\ngyp info spawn args 'make',\ngyp info spawn args '-I',\ngyp info spawn args '/opt/le_project/client/node_modules/microtime/build/config.gypi',\ngyp info spawn args '-I',\ngyp info spawn args '/usr/share/yarn/node_modules/node-gyp/addon.gypi',\ngyp info spawn args '-I',\ngyp info spawn args '/opt/le_project/.node-gyp/7.8.0/include/node/common.gypi',\ngyp info spawn args '-Dlibrary=shared_library',\ngyp info spawn args '-Dvisibility=default',\ngyp info spawn args '-Dnode_root_dir=/opt/le_project/.node-gyp/7.8.0',\ngyp info spawn args '-Dnode_gyp_dir=/usr/share/yarn/node_modules/node-gyp',\ngyp info spawn args '-Dnode_lib_file=node.lib',\ngyp info spawn args '-Dmodule_root_dir=/opt/le_project/client/node_modules/microtime',\ngyp info spawn args '-Dnode_engine=v8',\ngyp info spawn args '--depth=.',\ngyp info spawn args '--no-parallel',\ngyp info spawn args '--generator-output',\ngyp info spawn args 'build',\ngyp info spawn args '-Goutput_dir=.' ]\ngyp ERR! build error \ngyp ERR! stack Error: not found: make\ngyp ERR! stack at getNotFoundError (/usr/share/yarn/node_modules/which/which.js:13:12)\ngyp ERR! stack at F (/usr/share/yarn/node_modules/which/which.js:68:19)\ngyp ERR! stack at E (/usr/share/yarn/node_modules/which/which.js:80:29)\ngyp ERR! stack at /usr/share/yarn/node_modules/which/which.js:89:16\ngyp ERR! stack at /usr/share/yarn/node_modules/isexe/index.js:42:5\ngyp ERR! stack at /usr/share/yarn/node_modules/isexe/mode.js:8:5\ngyp ERR! stack at FSReqWrap.oncomplete (fs.js:114:15)\ngyp ERR! System Linux 4.9.13-moby\ngyp ERR! command "/usr/local/bin/node" "/usr/share/yarn/node_modules/node-gyp/bin/node-gyp.js" "rebuild"\ngyp ERR! cwd /opt/le_project/client/node_modules/microtime\ngyp ERR! node -v v7.8.0\ngyp ERR! node-gyp -v v3.6.1\ngyp ERR! not ok"
info This module is OPTIONAL, you can safely ignore this error