!deploy v0.1.5 with a couple fixes and new features

## 0.1.5 - 2019-08-22

* Added `Export-PSProfileConfiguration` to export your configuration to a portable file.
* Fixed bug with `Edit-PSProfilePrompt` that tried to run a non-existent function after editing was finished.
* Swapped the `Temporary` switch parameter with `Save` on `Edit-PSProfilePrompt` to align with the rest of the functions.
* Updated the `_loadPrompt()` method on the `$PSProfile` object to not force load a default prompt if a default prompt name has not been specified yet.
* Updated README with better details.
* Updated Wiki content.
* Updated CONTRIBUTING.md.

PSProfile/Classes/PSProfile.Classes.ps1

@@ -286,7 +286,7 @@ class PSProfile {
             "LoadPrompt",
             "Debug"
         )
-        if ($null -ne $this.Settings.DefaultPrompt) {
+        if (-not [String]::IsNullOrEmpty($this.Settings.DefaultPrompt)) {
             $this._log(
                 "Loading default prompt: $($this.Settings.DefaultPrompt)",
                 "LoadPrompt",