working on namespaces.
preparing for subtree splits.
swap components to dev-master temporarily while splitting.
swap aliases.
update all deps to 4.0.x in components.
Update src/Illuminate/Filesystem/Filesystem.php

Cleaning up a minor typo and inconsistent reference to iterator.
Update Filesystem.php

Unlink should not throw any warnings. It messes up the cache driver.
Remove locks from file system.
Update Filesystem.php

file_exists() return true for folder.
Filesystem::get() will return false instead of FileNotFoundException() if $path is a folder
Update Filesystem.php

Adding isFile
Add phpunit to Illuminate component dependencies
Returning unlink function
Return and suppress unlink function in Filesystem
Add is_writable equivalent to Illuminate\Filesystem\Filesystem as discussed in [#1043]

Signed-off-by: crynobone <crynobone@gmail.com>
Fix translator choice replacements.
Fix file cache flush deleting .gitignore files. Fixes #1071.
Collection `map` and `filter` both return new `Collection` instances now. Closes #1125.
cleaning up bigint and mediumint code.
Use realpath when checking modification time.
Add license to composer files.