Do not set prompt when importing oh-my-posh

Closes #100

README.md

@@ -70,11 +70,20 @@ You need to use the [PowerShell Gallery][powershell-gallery] to install oh-my-po
 
 Install posh-git and oh-my-posh:
 
-```bash
+```powershell
 Install-Module posh-git -Scope CurrentUser
 Install-Module oh-my-posh -Scope CurrentUser
 ```
 
+Enable the prompt:
+
+```powershell
+# Start the default settings
+Set-Prompt
+# Alternatively set the desired theme:
+Set-Theme Agnoster
+```
+
 In case you're running this on PS Core, make sure to also install version 2.0.0-beta1 of `PSReadLine`
 
     Install-Module -Name PSReadLine -AllowPrerelease -Scope CurrentUser -Force -SkipPublisherCheck

oh-my-posh.psm1

@@ -4,22 +4,6 @@
 . "$PSScriptRoot\Helpers\PoshGit.ps1"
 . "$PSScriptRoot\Helpers\Prompt.ps1"
 
-<#
-        .SYNOPSIS
-        Method called at each launch of Powershell
-
-        .DESCRIPTION
-        Sets up things needed in each console session, aside from prompt
-#>
-function Start-Up {
-    if(Test-Path -Path ~\.last) {
-        (Get-Content -Path ~\.last) | Set-Location
-        Remove-Item -Path ~\.last
-    }
-
-    Set-Prompt
-}
-
 <#
         .SYNOPSIS
         Generates the prompt before each line in the console
@@ -217,4 +201,3 @@ Register-ArgumentCompleter `
 
 $sl = $global:ThemeSettings #local settings
 $sl.ErrorCount = $global:error.Count
-Start-Up # Executes the Start-Up function, better encapsulation