NuGetPack.getIdFromMsbuildTask got broken by csprojPath type change

[ilya-yamschikov]

There was a commit 2ead8da that has changed NuGetPack class.
A type of csprojPath field has changed from String to File.
This field is used in getIdFromMsbuildTask method that left unchanged:

gradle-nuget-plugin/src/main/groovy/com/ullink/NuGetPack.groovy

Lines 174 to 178 in 045fc69

	String getIdFromMsbuildTask() {
	def isInputProject = { csprojPath.equalsIgnoreCase(it.projectFile) }
	def msbuildTask = project.tasks.find {
	it.class.name.startsWith("com.ullink.Msbuild") && it.projects.values().any(isInputProject)
	}

Now when there's an msbuild task in the project and I want to take the Id from it I get an exception on line 175:
No signature of method: java.io.File.equalsIgnoreCase() is applicable for argument types (String) ...